The Treger/Saint Silvestre Collection integrates more than a 1700 works of Art Brut, Singular Art and Contemporary Art. This specific nature turns it unique at the Iberian Peninsula. The Collection is one of the richest private collections in the world and englobes the classic Art Brut authors, such as Adolf Wölfli, Henry Darger, Martín Ramírez, Friedrich Schröder-Sonnenstern, Giovanni Battista Podestà and Oskar Voll, as well as more recent discoveries, like Ezekiel Messou, Guo Fengyi, Giovanni Galli, Miroslav Tichý and Eugene Von Bruenchenhein.
Since 2014 the Collection has been open to public at Centro de Arte Oliva in the city of São João da Madeira in Portugal. In 2017 the Collection has received the “Collector” award by APOM – Portuguese Association of Museology.